If a water meter causes head loss, which parameter is affected most directly?

If a water meter causes head loss, which parameter is affected most directly?

• A. Flow rate
• B. Volume
• C. Pressure
• D. Temperature

Answer: (C)

Head loss from a water meter removes energy from the flowing water, and that loss shows up most directly as a drop in pressure downstream. The meter creates resistance and friction as water squeezes through, converting some of the fluid’s energy into heat and turbulence. That energy loss lowers the pressure head available downstream, so you measure lower pressure after the meter. Volume and flow can be affected indirectly as the system responds to this pressure change, and temperature is largely unchanged in normal distribution conditions. But the immediate, direct effect of head loss is a decrease in pressure, which is why pressure is the correct choice.

Head loss from a water meter removes energy from the flowing water, and that loss shows up most directly as a drop in pressure downstream. The meter creates resistance and friction as water squeezes through, converting some of the fluid’s energy into heat and turbulence. That energy loss lowers the pressure head available downstream, so you measure lower pressure after the meter.

Volume and flow can be affected indirectly as the system responds to this pressure change, and temperature is largely unchanged in normal distribution conditions. But the immediate, direct effect of head loss is a decrease in pressure, which is why pressure is the correct choice.